Gaia-4b and 5b: Radial Velocity Confirmation of Gaia Astrometric Orbital Solutions Reveal a Massive Planet and a Brown Dwarf Orbiting Low-mass Stars

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dc.catalogadorjwg
dc.contributor.authorStefansson, Gudmundur
dc.contributor.authorMahadevan, Suvrath
dc.contributor.authorWinn, Joshua N.
dc.contributor.authorMarcussen, Marcus L.
dc.contributor.authorKanodia, Shubham
dc.contributor.authorAlbrecht, Simon
dc.contributor.authorFitzmaurice, Evan
dc.contributor.authorMikulskyte, One
dc.contributor.authorCanas, Caleb I.
dc.contributor.authorEspinoza Retamal, Juan Ignacio
dc.contributor.authorZwart, Yiri
dc.contributor.authorKrolikowski, Daniel M.
dc.contributor.authorHotnisky, Andrew
dc.contributor.authorRobertson, Paul
dc.contributor.authorAlvarado-Montes, Jaime A.
dc.contributor.authorBender, Chad F.
dc.contributor.authorBlake, Cullen H.
dc.contributor.authorCallingham, J. R.
dc.contributor.authorCochran, William D.
dc.contributor.authorDelamer, Megan
dc.contributor.authorDiddams, Scott A.
dc.contributor.authorDong, Jiayin
dc.contributor.authorFernandes, Rachel B.
dc.contributor.authorGiovinazzi, Mark R.
dc.contributor.authorHalverson, Samuel
dc.contributor.authorLibby-Roberts, Jessica
dc.contributor.authorLogsdon, Sarah E.
dc.contributor.authorMcelwain, Michael W.
dc.contributor.authorNinan, Joe P.
dc.contributor.authorRajagopal, Jayadev
dc.contributor.authorReji, Varghese
dc.contributor.authorRoy, Arpita
dc.contributor.authorSchwab, Christian
dc.contributor.authorWright, Jason T.
dc.date.accessioned2025-03-18T19:18:57Z
dc.date.available2025-03-18T19:18:57Z
dc.date.issued2025
dc.description.abstractGaia astrometry of nearby stars is precise enough to detect the tiny displacements induced by substellar companions, but radial velocity (RV) data are needed for definitive confirmation. Here we present RV follow-up observations of 28 M and K stars with candidate astrometric substellar companions, which led to the confirmation of two systems, Gaia-4b and Gaia-5b, identification of five systems that are single lined but require additional data to confirm as substellar companions, and the refutation of 21 systems as stellar binaries. Gaia-4b is a massive planet (M = 11.8 +/- 0.7 MJ) in a P = 571.3 +/- 1.4 day orbit with a projected semimajor axis a0 = 0.312 +/- 0.040 mas orbiting a 0.644 +/- 0.02M circle dot star. Gaia-5b is a brown dwarf (M = 20.9 +/- 0.5MJ) in a P = 358.62 +/- 0.20 days eccentric e = 0.6423 +/- 0.0026 orbit with a projected angular semimajor axis of a0 = 0.947 +/- 0.038 mas around a 0.34 +/- 0.03M circle dot star. Gaia-4b is one of the first exoplanets discovered via the astrometric technique, and is one of the most massive planets known to orbit a low-mass star.
dc.fuente.origenORCID
dc.identifier.doi10.3847/1538-3881/ada9e1
dc.identifier.eissn1538-3881
dc.identifier.issn0004-6256
dc.identifier.urihttps://doi.org/10.3847/1538-3881/ada9e1
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/102772
dc.identifier.wosidWOS:001413040200001
dc.information.autorucInstituto de Astrofísica; Espinoza Retamal Juan Ignacio; S/I; 1025598
dc.issue.numero2
dc.language.isoen
dc.nota.accesocontenido completo
dc.publisherIOP Publishing Ltd
dc.revistaASTRONOMICAL JOURNAL
dc.rightsacceso abierto
dc.subject.ddc520
dc.subject.deweyAstronomíaes_ES
dc.titleGaia-4b and 5b: Radial Velocity Confirmation of Gaia Astrometric Orbital Solutions Reveal a Massive Planet and a Brown Dwarf Orbiting Low-mass Stars
dc.typeartículo
dc.volumen169
sipa.codpersvinculados1025598
sipa.trazabilidadORCID;2025-03-03
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